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Find the correctly matched pairs and choose the correct option I. Leptotene – The chromosomes become invisible II. Zygotene – Pairing of homologous chromosomes III. Pachytene – Dissolution of the synaptonemal complex takes place IV. Diplotene – Bivalent chromosomes appear as tetrads V. Diakinesis – Terminalisation of chiasmata takes place |
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a) |
I and II |
b) |
II and IV |
c) |
II and V |
d) |
II and III |
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Find the correctly matched pairs and choose the correct option I. Leptotene – The chromosomes become invisible II. Zygotene – Pairing of homologous chromosomes III. Pachytene – Dissolution of the synaptonemal complex takes place IV. Diplotene – Bivalent chromosomes appear as tetrads V. Diakinesis – Terminalisation of chiasmata takes place |
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a) |
I and II |
b) |
II and IV |
c) |
II and V |
d) |
II and III |
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(c) Leptotene The chromosomes appear as thin long threads and have a beaded appearance due to the presence of chromomeres Pachytene Dissolution of the synaptonemal complex takes place in zygotene. The characteristic phenomenon during pachytene is the exchange of chromosomal segments, i.e., the recombination of genes or crossing over Diplotenes Tetrads formation takes place in pachytene stage. In diplotene the paired chromosomes begin to separate but remains united at the points of interchange of chiasma |